Here's my idea for an experimental bicycle design. Basically I take the front fork and position it horizontally. I want to know what kind of mechanical stress the frame might experience and how to overcome those difficulties.
Here's my idea for an experimental bicycle design. Basically I take the front fork and position it horizontally.
How is that different from pic related except for your design being about as awful as it can be. I don't think mechanical design is in your future.
And if my pic has a huge stupid transparency across it, it's because I didn't waste time fixing OP's crap. Graphic design is not in his future either.
OP your "experimental bicycle design" is just a lowrider bicycle.
People have been making them for years.
To answer your question, if you look at photos of lowriders, you'll notice they all have the diagonal support shown in
That's a springer front end with articulated linkages, not a fixed support.
What problem are you trying to solve?
normal bikes aren't moronic enough
Looks like it would be very painful
He's a big guy
> kind of mechanical stress the frame might experience
You’re putting 100% of the stress in the right angle joint (weld), and the suspension does frick all unless you ride it straighy into a wall which you probably will because steering will be highly unstable if it works at all
Seems to work for professional cargo bikes
Bicycle and tricycle steering geometry and wheel loading/unloading in turns and when braking (and howcthey all relate and interact) are very, very different.
Biggest difference is that bicycles lean in turns, nearly all tricycles including that cargo bike do not.
Besides the lunnecessary loads on the added fork joi t and suspension issues pointed out in , changing the fork angle relative to level the way this "design" does and moving the from axle forward will have the effect of increasing the turning radius and also makes the front wheel want to turn to lat flat to the road surface without starting input to hold it vertical and aimed forward. At best it makes a bike more work to keep upright, and at worst makes it prone to crashing from the tiniest moment of inattention or unanticipated steering input from road surface changes, ricks and debris, etc.
Some of that rake is intended to help it want to turn off a straight track with minimal effort and help it lean smoothly in turns but it's a fine balance. Note that in picrel the illustration has been shifted so both wheels as drawn touch the ground, thisxalone changes the rake angle by a couple of degrees in the direction of less control.
Have you ever ridden such a bike, even empty they suck, steering feels like rowing with huge paddles, and gets harder the slower you go, and then there's cargo to be added....
why dont those bikes ever have steering wheels? sure it adds complexity and maintenancy cost but it would allow you more leverage with some gearing.
This is so moronic, why not have the 2 wheels in the back, then steer with 1 in the front? If you stack cargo high enough, you can't even see, and steering 2 wheels in the front is moronic.
If you HAD to have 2 wheels on the front, you'd want to make some mechanism that allows you to steer by pivoting the back wheel instead of the two front wheels. Similar to how most forklifts steer using the rear tires.
Traditional trikes are extremely sensitive to weight distribution and even a small imbalance towards the rear wheels can make them uncontrollable in both steering and braking.
NTA, two wheels on the front is more stable in corning and braking than the traditional tricycle design.
Two wheels at the back attracts homeless riders, whereas at the front you can see them trying and punch at them before they latch on
how does this thing even steer
Left and right?
Sorry, meant the points made by
So nobody’s going to point out that the bike is impossible to steer?
No, because it isn't true. It will be more difficult than necessary both in raw effort required and in skill/ attention needed to maintain control, and that's been pointed out a number of times already, and it's nowhere near the kind of extremes people go to when raking front ends, that also aren't "impossible" to steer.
If the wheelbase and fork axis don't change, the path the forks in picrel might take don't really matter one way or another to how it will steer. But it will steer radically different than a stock bike without that extended wheelbase and extreme rake.
Where did this trend even come from, seems mega moronic and fugly.
Actually NVM, looking at older bikes, someone probably just extended one to get bit more rake angle and then kept going for the lulz.
>But it will steer radically different than a stock bike
it does not matter that much since most steering on a bike comes from leaning over to one side
unless you are traveling almr4jost at walking speed
It matters a great deal; while that isn't incorrect (and has already been mentioned) you are ignoring the fact that how fast a bike responds to that lean input, what it's turning radius will be, and how quickly (or if) the front wheel naturally tracks back to center when you stop leaning are all inextricably tied to the fork angle, length, and related steering geometry measurements and the effects they induce on the vehicle as a whole become more pronounced at speed, not less.
Those angles and dimensions also change as the vehicle leans which can alter handling dramatically.
Read up on "trail" and then consider the implications of picrel-
https://en.m.wikipedia.org/wiki/Bicycle_and_motorcycle_geometry
>the effects they induce on the vehicle
OP here. I'm trying to design a bike that goes into death wobble at any speed. It's going to be a birthday gift for my wife's son.
>the wheelbase and fork axis don't change
They do, are you blind?
Way to selectively edit and misquote what was actually said, moron. Only question now is whether you did it deliberately or just can't read.
try building this https://www.youtube.com/watch?v=PX3A7GLtFqM
while that's an impressive accomplishment, it's one of the stupidest most useless things ever.
>one of the stupidest most useless things ever
We're in a thread about bicycles.
>We're in a thread about bicycles.
to be precise, we're in a thread about stupid useless bicycle mods, so yeah, that video fits perfectly here, and OP's magnificent design would be great with that moronic back wheel mod.
>demoralization thread
You're destroying the suspension for no reason, as well as the new "headtube". How the frick do you steer that nonsense?
Go back to PrepHole, Moron.
What is there not enough PEX threads? Do simple engineering questions not belong on a literal basket weaving board?
Google "leading link fork motorcycles". Benelli made one. Might give you some inspiration, if nothing else.
When I was about 14 or 15 years old I hacksawed off the front forks of a couple bicycle frames and jammed the forks into one another to make a chopper type bike with 3 times as long front forks as usual. It didn’t work for shit and was pretty unstable to ride and even then I think it probably worked better than OP idea will.
You couldn't turn the handlebar to steer it.
You need to angle the head tube to accommodate. Look at choppers, they have to overcome the same problems
A vertical force on a horizontal set up like that is multiplied.
Maybe put shocks on a diagonal, with a pivot point at the bottom corner of the forks. It would more or less be as effective as vertical suspension forks.
How about this design. It's basically the same except using two forks and some support beams
steering that would suck ass.
especially at low speeds, as you have to move wheels that aren't naturally turning on the same axis as the steering axis... basically dragging the wheels sideways. i know from experience that these types of bikes with cargo racks, even when empty, steering is heavy.
Bimota has built (or is still building?) a motorcycle with a similar design.
The "Tesi".
Another picture for reference.
That's hub center steering; the swing arm portion bolts directly to the frame and pivots up and down but not side to side, only the axle and wheel hub do.
Learn rake and trail. You just randomly pulled this shit out of your ass for a bait thread since anyone serious would have studied how steering works then instantly seen why the first two pics are utterly moronic and why they are not an Earles or other similar-appearing but not similar-acting fork.
Go do your homework.
With the right material, this would be a great passive suspension frfr ong
There are two issues here.
A. Shock is going to damage the weakest point in the front fork, which could fracture over time, bend out or suffer a catastrophic failure
B. The wheel would twist sideways, and even 5 degrees of flex multiplied by the radius of the wheel would change where it the bike contacted the ground.
That design is going to be dangerous to ride. I tried something like it by welding a set of forks together with some dump bikes to see how bad it was, it was terrible. The front wheel snaps one way or another. You need to rotate the steering shaft angle to be more horizontal like a chopper bike. This prevents the wheel from snapping one way or another.
What are you trying to achieve? Just being different?